Two-Stage Pulse Signal Controller for Inertial Device
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Solution Overview
Problem
Existing control systems for inertial devices using pulse signals, such as PWM and PDM, face challenges in maintaining accuracy due to variations in full-scale levels and plant parameters, leading to perturbations that feedback controllers struggle to manage effectively, especially when these variations are fast or large, resulting in decreased control performance and increased system complexity.
Innovation Solution
A two-stage PWM control method is introduced, where a first stage PWM signal is generated and then adjusted based on real-time sensing values to produce a second stage PWM signal, allowing for quick compensation of perturbations and maintaining precision independent of compensation mechanisms, which can be applied to various pulse signals including PWM and PDM.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedback control is used to compensate for variations in full-scale level and plant parameters, then control accuracy is improved, but system complexity increases due to the need for robust feedback controllers and bandwidth management
Solution Approach 1:
The control system is divided into two distinct stages: a first stage PWM signal generation and a second stage adjustment based on real-time sensing. This segmentation allows each stage to focus on specific control tasks, simplifying the overall system architecture while maintaining high control accuracy through targeted compensation at the second stage.
Solution Approach 2:
The first stage PWM signal is generated in advance with predetermined parameters, and the second stage performs real-time adjustments based on sensing feedback. This preliminary action approach allows the system to prepare control signals beforehand while still achieving accurate compensation for parameter variations through the second stage adjustment.
2Measurement precision
If high precision driving sources and robust plants are used to maintain small parameter variations, then control precision is improved, but system cost and complexity increase
Solution Approach 1:
The control system uses real-time sensing values from the plant itself to generate adjustment signals in the second stage. This self-service approach allows the system to automatically compensate for its own parameter variations without requiring external high-precision driving sources or robust plant designs, reducing system complexity while maintaining control precision.
3Stability of the object's composition
If the PWM period is kept constant and much lower than the time constant of the inertial device, then control stability is improved, but response speed to parameter variations deteriorates
Solution Approach 1:
The control system uses periodic PWM signals with constant period for stable control, while incorporating real-time sensing and adjustment mechanisms that operate within this periodic framework. This allows the system to maintain stability through regular periodic control while still responding to parameter variations through the adjustment stage that modifies pulse parameters within each period.
Data Source
AI summary
An apparatus and method for controlling a device using pulse signals. In the apparatus and method, a two-stage control is used to generate pulse signals, which can be a PWM signal, a pulse signal including a PWM signal with a sleeping time, or a PDM signal. The two-stage control includes a second stage control, which generates pulse signals according to parameter values generated periodically by a first stage according to a target value and feedback sensing values. The two-stage control can be used in decreasing perturbation in a closed-loop control and accurate open-loop control.